Sewing-machine attachment.



- J. O. OSTMAN.

SEWING MAGHINE ATTACHMENT.

APPLIOATION FILED APR. 5, 1910.

Patented N0v.15, 1910.

, INVENTOR (/USEPH Q 0S7M/7/V' WIT/VESSES: V

ATTORNEYS THE NORRIS ps'rsns co. WASHINGTON, n. c.

nnro.

JOSEPH O. OSTMAN, OF HANCOCK, MICHIGAN, ASSIGNOR 0F ONE-FOURTH TO AXELIMMO AND ONE-FOURTH T0 ARTHUR ABRAMSON, OF HANCOCK, MICHIGAN.

SEWING-MACHINE ATTACHMENT.

Specification of Letters Patent. Patented NOV. 15, 1910,

Application filed April 5, 1910. Serial No. 553,483.

To all whom it may concern:

Be it known that I, J OSEPH O. OS'IMAN, a citizen of the United States,and a resident of Hancock, in the county of Houghton and State ofMichigan, have made certain new and useful Improvements inSewing-Machine Attachments, of which the following is a specification.

My invention is an improvement in sewing machine attachments, andconsists in certain novel constructions and combinations of parts,hereinafter described and claimed.

The object of the invention is to provide an attachment for preventingreverse motion in machines of the character specified, which may beapplied to existing machines without material changes, and which whenthe machine is not in the actual operation of sewing will not effect theoperation thereof in any manner.

Referring to the drawings forming a part hereof, Figure l is a side Viewof the improvement, and Figs. 2 and 3 are sections on the lines 2-2 and33 respectively of Fig. l.

The present embodiment of the invention is shown attached to the head 1of a sewing machine of any approved type, and consists of a cam lever 2,provided at one side with a lug 3 having a transverse perforation 4: andthe lever is cut away at 5 at the sides of the lug to form an arc-shapedshoulder 6 on each side, whose center is the perforation. A yoke 7 isprovided with spaced arms 8 extending in one direction, and with athreaded stem 9 extending in the opposite direction, and passing throughan opening 10 in the casing. of the head, and engaged by a nut 11, tohold the yoke in place. The arms 8 of the yoke receive the lug 3 betweenthem, and a screw 12 is passed through openings in the arms whichregister with the opening 42 of the lug. The opening in one arm isthreaded to prevent disengagement of the screw, and the lever is free torock on the screw as a pivot. The-upper end of the lever isformed intoan eccentric cam face 13, which is adapted, when the lever is swingingfree, to engage the driving shaft of the machine, and at its lower endthe lever is provided with a concave surface 14 on the opposite sidefrom the lug, and with a toe 15 extending laterally in the oppositedirection from the lug 3. A split bearing ring 16 is secured on thepresser foot bar 17 of the machine, the ends 18 of the ring being bentlaterally and transversely perforated, and a rod 19 is provided with anangular threaded portion 20, offset laterally as at 21 from the rod, andpassing through the openings of the said ends. The angular portion 20 isprovided with a fixed collar 22 for engaging the outer face of one ofthe ends 18 of the ring, and a nut 23 is threaded onto the rod andengages the outer face of the other end. By loosening the nut 23, thebearing ring may be adjusted on the bar and is held in adjustedposition, when the nut is tightened. The upper end of the rod 19 is inposition to engage the toe 15 of the lever, and swing the said lever onits pivot, when the presser foot bar is lifted, and when the said bar islowered, the rod is moved out of engagement with the toe of the lever.The needle bar 24: is connected to the disk 25 on the end of the drivingshaft, 29, by means of a link 26, pivoted at one end to a wrist pin 27on the disk, and at the other end to a collar 28 on the needle bar. Theare upon which the cam face or shoe 13 is formed is eccentric to thepivot of the lever so that when the drive shaft is rotating in a forwarddirection, the movement of the shaft tends to swing the upper end of thelever to the right of Fig. 1. When, however, the shaft rotates in areverse direction, the movement thereof tends to swing the upper end ofthe lever in an opposite direction, and the high portion of the cam faceacts as a brake to block the movement of the shaft. The cam face 13 ofthe lever acts as a brake shoe, and engages the periphery of the disk25, when the lever swings into the position shown in Fig. 1, and whenthe presser foot bar is lifted, the cam face 18 is moved out ofengagement with the disk, by the swinging of the lever;

In operation, when the presser foot is lifted, the material may beadjusted, and

the needle bar may be moved freely for any necessary purpose, as forthreading the needle and the like. lVhen the foot is lowered into thematerial however, the rod 20 moves downward with the bar disengaging thetoe, and permitting the lever to swing to bring the braking surface orface 13 into contact with the periphery of the disk. When so enga ed,the disk is free to rotate in a forward direction, but any attempt torotate in a reverse direction will be pre vented, by the engagement ofthe cam face or brake shoe 13 with the periphery of the disk. The moreforce applied in the reverse direction, the tighter will the cam face beforced against the disk. The stoppage or braking action while quick isnot so abrupt as to cause damage. The attachment may be applied toexisting machines with but little change, requiring only the drilling ofthe opening 10.

The bearing ring may be adjusted to the exact point to give the bestresults, and it will be evident that when the machine is not in theactual operation of sewing, the attachment is out of action, and doesnot alfeet the operation of the machine in any manner.

While the cam face is shown as engaging the periphery of the disk, itmight without change in principle be applied directly to the shaft, thedisk being practically the shaft, and the cam lever is engaged with thedisk merely to secure a quicker braking action.

I claim 1. The combination with a sewing machine, of a bearing ringadjustably mounted on the presser foot bar, a rod extending upwardlyfrom the ring, a yoke connected with the head of the machine, a leverprovided intermediate its ends with a lugpivoted between the arms of theyoke, and having at its upper end a cam faco forming a brake shoe forengagement with the driving shaft of the machine to prevent reversemovement thereof, said lever having a toe at its lower end forengagement by the rod when the presser foot bar is moved upwardly, toswing the lever to disengage the brake shoe from the shaft.

2. The combination with a sewing machine, of a lever pivotedintermediate its ends to the head of the machine and provided at itsupper end with a cam face forming a brake shoe, the lever having anangular toe at its lower end, a rod adjustably mounted on the presserfoot bar for engaging the toe to swing the lever when the bar is raisedto hold the shoe out of contact with the shaft.

3. The combination with a sewing machine, of a lever pivotedintermediate its ends to the head, and having an eccentric cam face atits upper end normally engaging the drive shaft to prevent reversemovement thereof, said lever having an angular toe, a bearing ringadjustably mounted on the presser foot bar, and a rod connected with thering, and engaging the toe to swing the cam face out of engagement withthe shaft when the said bar is lifted.

4. The combination with a sewing machine, of a lever pivotedintermediate its ends to the head, and having an eccentric cam face atits upper end normally engaging the drive shaft to prevent'reversemovement thereof, said lever having an angular toe, a bearing ringadjustably mounted on the presser foot bar, and means supported by thering for engaging the toe to swing the cam face out of engagement withthe shaft when the said bar is lifted.

5. The combination with a sewing machine, of a lever pivotedintermediate its ends to the head, and having an eccentric cam face atits upper end normally engaging the drive shaft to prevent reversemovement thereof, said lever having an angular toe, and means adjustably supported on the presser foot bar for engaging the toe to swingthecam face out of engagement with the shaft when the said bar islifted.

6. The combination with a sewing machine, of a lever pivotedintermediate its ends to the head, and having an eccentric cam face atits upper end normally engaging the drive shaft to prevent reversemovement thereof, and means adjustable on the presser foot bar forengaging the lever to swing the cam face out of engagement with theshaft when the said bar is lifted.

7. An attachment for sewing machines, comprising a lever, means forpivotally supportlng the lever intermediate its ends, means fordetachably connecting said means with the machine, said lever having acam face eccentric to the pivot at its upper end for engaging thedriving shaft of the machine to prevent reverse movement, a bearingring, means for detachably and adjustably connecting the ring with thepresser foot bar, and means on the ring for engaging the bar to swingthe cam face out of engagement with the shaft when the said bar islifted.

8. The combination with a sewing machine, of a lever having an eccentriccam face at one end normally engaging the drive shaft to prevent reverserotation thereof, and means adjustably supported on the presser foot barfor moving the lever to swing the cam face out of engagement with theshaft when the said presser foot bar is lifted.

9. The combination with a sewing machine, of means engaging the driveshaft to prevent reverse rotation thereof, means on the presser foot barfor moving the said means out of engaging position when the 1 on thepresser foot bar for moving the said presser foot bar is lifted, andmeans for admeans out of engaging position When the justably supportingthe said means on the presser foot bar is lifted.

presser foot bar. JOSEPH O. OSTMAN. 5 10. The combination With a sewingma- Witnesses:

chine, of means engaging the drive shaft to JOHN KiisKILA,

prevent reverse rotation thereof, and means SAMUEL JUNTTILA.

